What Are the Requirements of the Base Wall for UHPC Exterior Wall Panel Installation and Key Technical Points Analysis

The quality of a building's exterior wall concerns not only aesthetic presentation but also determines the building's safety and durability. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong has always upheld the mission of “creating beautiful architecture.” In the application of Ultra-High Performance Concrete (UHPC) exterior wall panels, Qinglong profoundly understands the decisive role that substrate wall treatment and installation technology play in overall project quality. Below, we provide a professional analysis for designers and owners from two aspects: substrate wall requirements and key technical points.

I. Core Requirements of UHPC Exterior Wall Panels for the Substrate Wall

As the load-bearing foundation for UHPC exterior wall panels, the quality of the substrate wall directly affects installation stability and long-term safety in use. Drawing on benchmark projects such as the Nanjing East Road Century Plaza renovation project, Qinglong has summarized three core requirements:

1. Structural Strength Compliance: The substrate wall must meet design load requirements; concrete walls should have a compressive strength of no less than C25, masonry walls should use solid bricks or concrete blocks, and surface flatness deviation must be controlled within ±3mm/2m. Qinglong's technical team conducts on-site rebound testing and 3D scanning to ensure the substrate's load-bearing capacity and flatness comply with the T/CBMF171-2022 standard for Ultra-High Performance Concrete (UHPC) Exterior Wall Panels.

2. Interface Treatment Standards: The substrate surface must be cleaned, repaired, and treated for interface enhancement. For concrete substrates, floating dust and oil stains should be removed and a dedicated interface agent applied; for masonry substrates, leveling with 1:3 cement mortar is required, followed by curing for more than 7 days. Qinglong's independently developed interface treatment system can increase the bonding strength between UHPC panels and the substrate by more than 20%.

3. Reliability of Embedded Parts and Keels: Hot-dip galvanized steel embedded parts must be pre-installed in the substrate, with spacing and position deviation not exceeding ±10mm, and the tensile load-bearing capacity of embedded parts must be no less than 15kN. Qinglong uses BIM technology to optimize the positioning of embedded parts, ensuring that connection nodes with UHPC panels meet seismic fortification intensity requirements.

II. Key Technical Points for UHPC Exterior Wall Panel Installation

With 28 years of construction experience, Qinglong has developed a technical system of “precise positioning, stable connection, and fine sealing” for UHPC exterior wall panel installation. The core points include:

1. 3D Positioning Technology: Combining total stations with BIM models achieves millimeter-level control of installation precision. In the Dongguan Women and Children's Activity Center project, Qinglong compared Rhino parametric modeling with on-site laser scanning to control panel joint deviation within ±2mm, ensuring the perfect presentation of the double-curved surface design.

2. Flexible Connection System: Customized aluminum alloy hangers and stainless steel adjustment bolts allow panels to displace by ±5mm under temperature changes. Connection nodes adopt an “anti-seismic limiting + anti-corrosion treatment” design, verified by 1000-hour salt spray testing to ensure durability of more than 30 years.

3. Sealing and Waterproofing Process: Panel joints adopt a “double sealing” solution—fireproof rock wool is filled on the inner side, and silicone weather-resistant sealant is applied on the outer side, with joint width controlled at 8-12mm and depth at 1.5 times the width. Qinglong's original “backing foam rod + double-sided tape” installation method effectively prevents sealant joint cracking and rainwater leakage.

4. Quality Traceability Management: Each UHPC panel is embedded with an RFID chip recording production batch, installation position, and other information. Combined with Qinglong's independently developed project management system, full life-cycle quality tracking is achieved. Meanwhile, a “three-inspection system” has been established, with 100% non-destructive testing conducted from factory prefabrication to on-site installation.

As a national high-tech enterprise and a participant in UHPC standard development, Qinglong always puts technological innovation and engineering quality first. Its full-chain service capability, from detailed design to after-sales maintenance, allows UHPC exterior wall panels to meet designers' creative expression while safeguarding owners' long-term safety of use. Looking ahead, Qinglong will continue to pursue its vision of “becoming a world-class leading manufacturer of UHPC/GRC/GRG/GRP,” providing higher-quality material solutions for the architectural decoration industry.